$4+2\left(5-3\right)+4-3\left(8-5\cdot2\right)$

$fac\frac{2x^2-x-3}{x+1}$

$3\left(x+5\right)\ge x-3$

$\left(\frac{13}{7}+\frac{1}{2}\right)^2$

$2\left(e^x\right)+e^{\frac{2x}{2}}$

$\int_3^6\left(8x-2\right)dx$

$\lim_{x\to\infty}\left(\frac{tan\left(x\right)}{x}\right)$